Which ingredient is known to cause allergic reactions in some individuals, notably in skincare products?

Pineapple extract is recognized for being a potential allergen in skincare products. This ingredient contains enzymes, such as bromelain, which can cause irritation or allergic reactions in some individuals, particularly those with sensitive skin or allergies to certain fruits. Pineapple extract is often used for its exfoliating properties and its ability to brighten the skin, yet its enzymatic activity can lead to adverse reactions.

In comparison, while shea butter, tea tree oil, and coconut oil may cause irritation in certain cases, they are generally considered safe for a wider range of users. Shea butter is known for its moisturizing properties, tea tree oil is valued for its antibacterial effects, and coconut oil serves as a moisturizer and skin soother. Though these ingredients can occasionally lead to breakouts or sensitivity, they are less commonly associated with allergic reactions compared to pineapple extract.